President Trump's refusal to certify that Iran is complying with its nuclear deal came after he "threw a fit," according to a source of the Washington Post. The president was, the Post reported, "incensed by the arguments of Secretary of State Rex Tillerson, Defense Secretary Jim Mattis, and others that the landmark 2015 deal, while flawed, offered stability and other benefits." That left Mr. Trump, the Post's source said, "furious. Really furious." Well, why shouldn't Mr. Trump have been furious?